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Telecommunication Bands (SHG / SFG / DFG / £q2: £q2)
Wavelength Conversion Waveguide
Wavelength ranges of the telecommunicating bands :


£q2: £q2 mixing involves the simultaneous frequency-mixing processes of SHG and DFG.

Mechanical Properties
Property
Specification
Tolerance
Substrate material

1.2mol% MgO-doped Stoichiometric Lithium Niobate (MgO:SLN)

 -
Congruent Lithium Niobate (CLN)
Length of QPM grating period 1~50 mm -
Length of mode filter/taper 1~5 mm (one side) -
Channel-to-channel separation 125 um (Typical) -
Crystal dimension L (length) 1~60 mm + 0.5 / - 0.5 mm
Crystal dimension W (width) 3~10 mm + 0.2 / - 0.2 mm
Crystal dimension T (thickness) 0.5 mm + 0.1 / - 0.1 mm


Nonlinear-Optical Properties
Property
Specification
Tolerance
Quasi-phase-matching wavelength
 
(desired OF mixing wavelength or operation wavelength) 		Depends on specification
 
e.g. 1550 nm SHG
1510 nm+1610 nm SFG 		¡Ó 0.5 nm
Quasi-phase-matching temperature
(or operation temperature) 		Depends on the specification
 
20~80 ¢XC (Typical for PPMgO:SLN WG) 		¡Ó 5 ¢XC
¡Ù 80 ¢XC (Typical for PP CLN WG)
Mode filed diameter (MFD)

(consider the WG integrated with mode filter/taper section)		 9.7 um (Y) * 7.3 um (Z),
optimized for 1550nm-band 		 ¡Ó 0.5 mm
4.5 um (Y) * 3.9 um (Z),
optimized for 775nm-band 
Propagation loss coefficient ¡Ø 0.25 dB/cm @ 1550 nm (PP MgO:SLN WG) -
¡Ø 0.35 dB/cm @ 1550 nm (PPCLN WG)  
Coupling efficiency ¡Ù 50% (Typical with AR coating @ 1550nm; 5cm long WG) -
 
Normalized conversion efficiency ¡Ù 80 %/W/cm2 (SHG Typical)
(for 5cm long WG, the conversion efficiency will be ¡Ù 2000%/W) 		-
Chip acceptance bandwidth (FWHM) 1 nm ¡D cm @1550 nm -
Temperature tuning coefficient 0.1 nm/¢XC ¡Ó 0.02 nm/¢XC